Fomular for finding perimeter area and circumference of a circle

The perimeter of a circle is the circumference of the circle.

CIRCUMFERENCE

There are two formulas:

1. C = πd (use if the problem gives you the diameter only)

2. C = 2πr (use if the problem gives you the radius only)

AREA

There are several area formulas for a circle but I think for you at your level of math, A = πr^2 is all you need to know.

But does not touch the horizontal axis.

Step-by-step explanation:

The curve of a normal distribution extends indefinitely at the tails but does not " ​touch the horizontal axis."

The reason for this is that the tails of the curve suggest that a variable can take on any theoretically reasonable value, although the probability of such occurrence is considerably low.

Generally, a normal distribution curve is considered to be asymptotic to the horizontal axis.